<?php

/**
 * @copyright  For copyright and license information, read the COPYING.txt file.
 * @link       /COPYING.txt
 * @license    Open Software License (OSL 3.0)
 * @package    Mage_Adminhtml
 */

/**
 * Order control model
 *
 * @package    Mage_Adminhtml
 */
class Mage_Adminhtml_Model_Sales_Order
{
    /**
     * Retrieve adminhtml session singleton
     *
     * @return Mage_Adminhtml_Model_Session
     */
    protected function _getSession()
    {
        return Mage::getSingleton('adminhtml/session');
    }

    public function checkRelation(Mage_Sales_Model_Order $order)
    {
        /**
         * Check customer existing
         */
        $customer = Mage::getModel('customer/customer')->load($order->getCustomerId());
        if (!$customer->getId()) {
            $this->_getSession()->addNotice(
                Mage::helper('adminhtml')->__(' The customer does not exist in the system anymore.'),
            );
        }

        /**
         * Check Item products existing
         */
        $productIds = [];
        foreach ($order->getAllItems() as $item) {
            $productIds[] = $item->getProductId();
        }

        $productCollection = Mage::getModel('catalog/product')->getCollection()
            ->addIdFilter($productIds)
            ->load();

        $hasBadItems = false;
        foreach ($order->getAllItems() as $item) {
            if (!$productCollection->getItemById($item->getProductId())) {
                $this->_getSession()->addError(
                    Mage::helper('adminhtml')->__(
                        'The item %s (SKU %s) does not exist in the catalog anymore.',
                        $item->getName(),
                        $item->getSku(),
                    ),
                );
                $hasBadItems = true;
            }
        }

        if ($hasBadItems) {
            $this->_getSession()->addError(
                Mage::helper('adminhtml')->__('Some of the ordered items do not exist in the catalog anymore and will be removed if you try to edit the order.'),
            );
        }

        return $this;
    }
}
